By the way, recently my daughter has shown me new web-service
Alltheviews that includes ratings from Michelin, Yelp and Zagat‘s websites, and visitors' opinion about restaurants from tripadvisor, foursquare, facebook and google, sort of all in one. There you can find info about eateries not only in Devon, but around all the UK.
However, there are places that are not very popular and have no reviews, in such cases I try to learn smth about on local forums, people often eat-out, but not always share their opinion, though heartily do this when asked.
In our computer age we can find out info easily and try out a lot of new.